J4Schema

In June 2011, three main search engines (Google, Bing and Yahoo) created a new standard for semantic search: schema.org .

Semantic search, what does it mean?

Let me show you a common situation.The word "Avatar" can have more meanings: it could be a film title, an user image on a forum and a lot of other things. We can understund what we're talking about using the context, a machine can't, it needs more information.

For this reason schema.org dictionary was created: adding its elements we can define if a man is a director movie, the length of a video or how many comments an item received.

WHICH ARE THE EFFECTS?

So, by now, a question should popped inside your mind: "Very nice, but why should I take this extra work?".Adding these tags won't make you climb position, but you'll have much more: your results will become nicer than simple links since they will be transformed in "rich snippets".